Installation and getting started with first app

[KennedyDayala]

if i remove that line and run the code I am not getting my Window displayed and here is the ouput..

Starting E:\Bose\Qt playground\IDT_Demo_UI-build-desktop\debug\IDT_Demo_UI.exe...
E:\Bose\Qt playground\IDT_Demo_UI-build-desktop\debug\IDT_Demo_UI.exe exited with code -1073741819

[goetz]

code -1073741819 = 0xC0000005. On windows this means an access violation. Seems like your UI is not initialized properly or messed up in some way....

[KennedyDayala]

perfect analysis..

I have moved this line to bottom of the code like this..

@
IDT_MainWindow::IDT_MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::IDT_MainWindow)

{
// my code here...

    ui->setupUi(this);

}
@

now i moved it to top and works fine..thanks a ton

[EDIT: code formatting, please use @-tags or the editor button, Volker]

[KennedyDayala]

only one child item is being shown to my TreeWidget..please look into my code and lemme know where I went wrong !!

@IDT_MainWindow::IDT_MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::IDT_MainWindow)

{
ui->setupUi(this);

ui->treeWidgetDrives->setColumnCount(1);
QStringList strlstHeaders;
strlstHeaders<<tr("Storage Drives");
ui->treeWidgetDrives->setHeaderLabels(strlstHeaders);

SetupTreeItems();

}
void IDT_MainWindow::SetupTreeItems()
{
QTreeWidgetItem *treeItems = new QTreeWidgetItem(ui->treeWidgetDrives);
treeItems->setText(0,tr("SystemDrives"));
QTreeWidgetItem *treeChildItems = new QTreeWidgetItem(treeItems);
QDir dir;
dir.setFilter(QDir::Drives);

QFileInfoList roots = dir.drives();

for(int i=0 ; i<roots.count() ; ++i)
{
    QFileInfo fiDrives = roots.at(i);
    QString strDrive = fiDrives.absoluteFilePath();
    treeChildItems->setText(i,strDrive);
}

}@

[goetz]

You must create a new item in your loop. You just overwrite the on you have in each iteration.

[andre]

Your loop keeps on updating the text of the same tree item. Do you really expect to see more of them then?

[KennedyDayala]

you mean like this ??

@for(int i=0 ; i<roots.count() ; ++i)
{
treeChildItems = new QTreeWidgetItem(treeItems);
QFileInfo fiDrives = roots.at(i);
QString strDrive = fiDrives.absoluteFilePath();
treeChildItems->setText(i,strDrive);
}@

[goetz]

[quote author="Thomas Kennedy" date="1301584395"]you mean like this ??

@for(int i=0 ; i<roots.count() ; ++i)
{
treeChildItems = new QTreeWidgetItem(treeItems);
QFileInfo fiDrives = roots.at(i);
QString strDrive = fiDrives.absoluteFilePath();
treeChildItems->setText(i,strDrive);
}@
[/quote]

You can try it to get the answer :-)

[KennedyDayala]

tried...it added an 'empty item' at 0th position,and 'c:' at 1st..and no more :-(

[andre]

So... you need to aquire some debugging skills... Just try to follow what happens in your code. Don't guess: measure instead. Try for instance to insert statements like this at every relevant point in your function, and look at the output:

@
qDebug() << LINE;
@

[KennedyDayala]

:-)) ok..will do that..

[goetz]

Of course you must have an empty first entry, because you create this one outside your loop (line 21 in your original code snippet).

This is the compactified working version:

@
void FancyClass::populate() {
ui->treeWidget->setColumnCount(1);
QStringList headers;
headers << "Storage Device";
ui->treeWidget->setHeaderLabels(headers);

QTreeWidgetItem *rootItem = new QTreeWidgetItem(ui->treeWidget);
rootItem->setText(0, "SystemDevice");

foreach(QFileInfo drive, QDir::drives()) {
    QTreeWidgetItem *driveItem = new QTreeWidgetItem(rootItem);
    driveItem->setText(0, drive.absoluteFilePath());
}

}
@

[andre]

/me is thinking that instead of building a tree like that himself, he would use a QFileSystemModel instead...

[KennedyDayala]

thanks a lot...I will try with QFileSystemModel too..

[KennedyDayala]

"The program can't start because mingwm10.dll is missing from your computer.Try reinstalling the program to fix this problem."

..i am getting this error when i tried running my application in stand alone mode...any help ??

[giesbert]

YOu are startin g without QtCreator, right?

Did you try to search the forum for answers?

see this "post":http://developer.qt.nokia.com/forums/viewthread/4869

[KennedyDayala]

yes Gerolf..I searched..everybody says that we need to set the invironment varioables..I did that too but of no use..

[giesbert]

put the needed dlls beside your exe or set the PATH environment variable to contain the path to mingw10.dll.

[KennedyDayala]

I have set the PATH environment variable..but it says QtCode4.dll is missing !!

[giesbert]

QtCode4? what's this? or do you mean QtCore4.dll?
Then the path to this dll is miossinmg :-)
You have to add it also.